mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/* Unmap a shared object's segments. NaCl version.
|
|
Copyright (C) 2015-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _DL_UNMAP_SEGMENTS_H
|
|
#define _DL_UNMAP_SEGMENTS_H 1
|
|
|
|
#include <link.h>
|
|
#include <sys/mman.h>
|
|
|
|
/* There is always a big gap between the executable segment and the data
|
|
segments. Other code segments and data pages lie in there. So we must
|
|
unmap each segment individually (except for a codeless module). */
|
|
|
|
static void __always_inline
|
|
_dl_unmap_segments (struct link_map *l)
|
|
{
|
|
if (l->l_contiguous)
|
|
/* Simple case. */
|
|
__munmap ((void *) l->l_map_start, l->l_map_end - l->l_map_start);
|
|
else
|
|
{
|
|
/* Normally l_phdr points into the RODATA segment, which we will
|
|
unmap in one iteration of the loop. So we cannot use it directly
|
|
throughout. */
|
|
|
|
struct { ElfW(Addr) start, end; } segments[l->l_phnum], *seg = segments;
|
|
|
|
for (const ElfW(Phdr) *ph = l->l_phdr; ph < &l->l_phdr[l->l_phnum]; ++ph)
|
|
if (ph->p_type == PT_LOAD)
|
|
{
|
|
seg->start = (l->l_addr + ph->p_vaddr) & -GLRO(dl_pagesize);
|
|
seg->end = (l->l_addr + ph->p_vaddr + ph->p_memsz
|
|
+ GLRO(dl_pagesize) - 1) & -GLRO(dl_pagesize);
|
|
if (seg > segments && seg[-1].end == seg->start)
|
|
/* Coalesce two adjacent segments into one munmap call. */
|
|
seg[-1].end = seg->end;
|
|
else
|
|
++seg;
|
|
}
|
|
|
|
do
|
|
{
|
|
--seg;
|
|
__munmap ((void *) seg->start, seg->end - seg->start);
|
|
}
|
|
while (seg > segments);
|
|
}
|
|
}
|
|
|
|
#endif /* dl-unmap-segments.h */
|